Im loading a bitmap into the renderer class and I want to render the texture centered in the screen with the right ratio and as big as it can be
The vertices and texture data:
private final float[] mVerticesData = { -1f, 1f, 0.0f, // Position 0 0.0f, 0.0f, // TexCoord 0 -1f, -1f, 0.0f, // Position 1 0.0f, 1.0f, // TexCoord 1 1f, -1f, 0.0f, // Position 2 1.0f, 1.0f, // TexCoord 2 1f, 1f, 0.0f, // Position 3 1.0f, 0.0f // TexCoord 3 };
private final short[] mIndicesData = { 0, 1, 2, 0, 2, 3 }; And the draw method :
public void onDrawFrame(GL10 glUnused) {
// Set the viewport GLES20.glViewport(0, 0, bitmap.width, bitmap.height); // Clear the color buffer GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT); // Use the program object GLES20.glUseProgram(mProgramObject); // Load the vertex position mVertices.position(0); GLES20.glVertexAttribPointer ( mPositionLoc, 3, GLES20.GL_FLOAT, false, 5 * 4, mVertices ); // Load the texture coordinate mVertices.position(3); GLES20.glVertexAttribPointer ( mTexCoordLoc, 2, GLES20.GL_FLOAT, false, 5 * 4, mVertices ); GLES20.glEnableVertexAttribArray ( mPositionLoc ); GLES20.glEnableVertexAttribArray ( mTexCoordLoc ); // Bind the texture GLES20.glActiveTexture ( GLES20.GL_TEXTURE0 ); GLES20.glBindTexture ( GLES20.GL_TEXTURE_2D, mTextureId ); // Set the sampler texture unit to 0 GLES20.glUniform1i ( mSamplerLoc, 0 ); GLES20.glDrawElements ( GLES20.GL_TRIANGLES, 6, GLES20.GL_UNSIGNED_SHORT, mIndices ); } Right now Im setting the viewport with the bitmap dimensions(not working). How should I calculate the viewport dimensions for the texture to fit the screen keeping the ratio?
thank you.
